Hi Tim -I thought that's what you meant, and wrote a response, but that question got deleted. So I'll say it again. The XT10 comes with either a 25mm eyepiece or with two eyepieces: a 25mm and a 10mm. The ones you get depend on which version of the XT10 you buy. The eyepieces are the heart of your scope; they determine the magnification and the quality of the image that you see. Since this scope has a 1200mm focal length, the magnification for these eyepieces (which can be determined by dividing the scope focal length by the eyepiece focal length) works out to 48x for the 25mm and 120x for the 10mm eyepiece.
In any case, you will probably do 90% of your observing with the 25mm. This is a good magnification for general viewing with this scope. It is much easier to find objects with it, and it is easy to see those objects once you find them. Using the 25mm, you will be able to see all of the planets, all of the Messier objects, and a lot of deep sky objects that Messier never saw. This list includes nebulae, star clusters, and galaxies.
You can use the 10mm, if you have it, to see additional details on the planets as well as the lunar surface. You will find that the 25mm and the 10mm provide a good combination. You will not need anything else for a while.
Eventually, you may want to invest in a premium eyepiece, since that is the best way to improve the view that you will get using that scope. But you don't need to do that yet. Use a 25mm and a 10mm, and take some time to learn the night sky and learn to use the scope.
Good Luck and Clear Skies!